billionaire

[bil-yuh-nair, bil-yuh-nair]
noun
a person who has assets worth a billion or more dollars, francs, pounds, or the like.

Origin:
1855–60, Americanism; billion + -aire, on the model of millionaire

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World English Dictionary
billionaire (ˌbɪljəˈnɛə)
 
n
a person whose assets are worth over a billion of the monetary units of his country

Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009
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Etymonline
Word Origin & History

billionaire
1861, Amer.Eng., from billion on model of millionaire. The first in the U.S. likely was John D. Rockefeller (1839-1937), some time after World War I.
Online Etymology Dictionary, © 2010 Douglas Harper
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Example sentences
It's the perfect amenity for any billionaire easily bored by old-fashioned
  static images.
My guess is that's what the billionaire who's building hotels in space thinks
  too.
The maverick billionaire blogger wants to take the film out of the film
  industry.
So, with a billionaire's logic, he hired his cardiologist to make a thorough
  search of the science of longevity.
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